(1):
(n.) Act of departure; leave-taking; a last look at, or reference to something.
(2):
(a.) Parting; valedictory; final; as, a farewell discourse; his farewell bow.
(3):
(n.) A wish of happiness or welfare at parting; the parting compliment; a good-by; adieu.
(4):
(interj.) Go well; good-by; adieu; - originally applied to a person departing, but by custom now applied both to those who depart and those who remain. It is often separated by the pronoun; as, fare you well; and is sometimes used as an expression of separation only; as, farewell the year; farewell, ye sweet groves; that is, I bid you farewell.